$B947/47431: 2's Complement FAC#1
Jump from $B8D4:
B947: A5 66 LDA $66 ; FAC Sign
B949: 49 FF EOR #$FF
B94B: 85 66 STA $66 ; FAC Sign
Jump from $BCAB:
B94D: A5 62 LDA $62 ; FAC Mantissa
B94F: 49 FF EOR #$FF
B951: 85 62 STA $62 ; FAC Mantissa
B953: A5 63 LDA $63 ; FAC Mantissa
B955: 49 FF EOR #$FF
B957: 85 63 STA $63 ; FAC Mantissa
B959: A5 64 LDA $64 ; FAC Mantissa
B95B: 49 FF EOR #$FF
B95D: 85 64 STA $64 ; FAC Mantissa
B95F: A5 65 LDA $65 ; FAC Mantissa
B961: 49 FF EOR #$FF
B963: 85 65 STA $65 ; FAC Mantissa
B965: A5 70 LDA $70 ; FAC low-order rounding
B967: 49 FF EOR #$FF
B969: 85 70 STA $70 ; FAC low-order rounding
B96B: E6 70 INC $70 ; FAC low-order rounding
B96D: D0 0E BNE $B97D
Jump from $BC23:
B96F: E6 65 INC $65 ; FAC Mantissa
B971: D0 0A BNE $B97D
B973: E6 64 INC $64 ; FAC Mantissa
B975: D0 06 BNE $B97D
B977: E6 63 INC $63 ; FAC Mantissa
B979: D0 02 BNE $B97D
B97B: E6 62 INC $62 ; FAC Mantissa
Jump from $B96D, $B971, $B975, $B979:
B97D: 60 RTS
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